Students affiliated with the Nepal Student Union, a student wing of the Nepali Congress Party, shout slogans during a protest demanding the immediate resignation of Prime Minister Baburam Bhattarai in Kathmandu May 31, 2012. Nepal's warring political parties said on Sunday they had failed to narrow their differences sufficiently to agree on a new constitution for the Himalayan republic before a midnight deadline, plunging the country into fresh political turmoil. REUTERS/Navesh Chitrakar (NEPAL - Tags: POLITICS CIVIL UNREST)